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Authors
Liu, Fei
Zhou, Yan
Wang, Yijiao
Liu, Xiaoyan
Wang, Jian
Guo, Hong
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Article History
Received: 4 May 2016
Revised: 15 June 2016
Accepted: 15 June 2016
First Online: 27 July 2016
Competing interests
: The authors declare no conflict of interest.
